Exothermic and endothermic reaction

What type of chemical reaction absorbs energy and requires energy for the reaction to occur?

• A. endothermic

• B. exothermic

• C. thermal energy

____ reactions usually feel cold.

• A. exothermic

• B. thermal energy

• C. endothermic

In an endothermic reaction, energy is _________.

• absorbed

• released

_____ reactions usually feel hot!

• enothermic

• exothermic

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

• A. The solution at the end is acidic

• B. The reaction is exothermic

• C. The reaction is reversible

• D. The reaction is endothermic

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

• A. endothermic

• B. exothermic

• C. thermal

• D. heat

A chemical reaction accompanied by the releasing of heat.

• A. endothermic

• B. exothermic

• C. thermal

• D. heat

When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as?

• A. exothermic

• B. activated

• C. decomposition

• D. endothermic

Which of these processes is always exothermic?

• A. evaporation

• B. burning

• C. insulation

• D. melting

___________means thermal energy is being released from the object or substance, so it feels hot to us.

• A. endothermic

• B. heat

• C. thermal

• D. exothermic